That probably has less to do with deliberate engineering and more to do with newer software being designed for more RAM in mind.Agreed. Deficient RAM is the primary cause of slowdown over time. It's engineered that way otherwise you wouldn't upgrade as often.
The rate of growth in base RAM sizes has slowed a lot over the past decade though, so increasing RAM demands in the future should be less of a concern than it used to be:
EDIT: To clarify, the above graph is for base RAM sizes for every separate Mac SKU introduced from 1984 to 2022. Presumably a plot for PCs during the same timeframe would look similar, but it's a lot harder to find all that data in one place. Also, please note that the Y-axis is log-scaled, because otherwise it's really hard to visualize.
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